Attention In-App Messaging API Developers ¿ This is formal notice that Websocket Notification Method GETNOTIFICATIONCONNECTIONDETAILS will be deprecated on May 30, 2015. Please do not start development using Websocket Notification, and if you are using it with In-App Messaging API in your Application please plan to remove it before May 30, 2015. In April AT&T is launching Webhooks Notification method for use with In-App Messaging API. More details on Webhooks Notification method, and how your application can take advantage of this notification service, will be made available as we get closer to launch.